I did a search on this but i still need some opinions. I just starting noticing tons of coolant draining from my drain hose on mile 35 of a 45 mile ride yesterday. I thought my bike was going to overheat so i beelined it back to my truck but my bike never did overheat. The next day (we were camping), i put 3 full large cups of water (no coolant on hand) in the radiator and just tested it out on a 8 mile ride or so. When i stop the bike after a mile or so, it is just pouring out. When i got back to the truck and cooled down, it took about 3-4 full cups of water this time. It is for sure leaking it all quick. I am not sure how much a full radiator holds, but it seemed to be pretty dry. My main question is why. Is it just the cap? Is it the water pump? Is it a bigger problem internally like a head gasket or other pressure issue? The bike is not overheating though at all. It is probably a bit hot, but without totally taking my bike apart, can i do some quick tests with a new radiator cap or other simple inexpensive tests before i take my bike in or rip it apart. Any help is much appreciated.